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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 18th September 2007
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Question missfire/studder?

i have noticed that at steady rpms, not high, but more than idle under load that my engine studders slightly and sounds as if its missfiring on a cylinder. doesnt happen when i give it a fair amount of gas just when im in say 3rd gear at 30 mph and holding steady. anyone have experience with this?
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  #2  
Old 18th September 2007
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Default

What kind of carb and air cleaner are you using? Have you rejetted and put in a dyno jet kit.
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Spoiled but definitely not rotten. Started life as a black 1993, 1200 Now-1218, Home ported 2009 FI heads, Andrews N6 cams, Dyna2Ki, JMC aluminum swingarm, Chainsikle custom mid forward controls, GBC inverted front end, 3 degree wide-glide trees and 5 degree raked cups. 18x3.5 fatspoke rear with 150/60 and 21x3.5 with 120/70.
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Old 18th September 2007
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Default

its a cv and yes its rejetted with 45/165 i think. and the ac is kinda like a small "big sucker"
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Old 18th September 2007
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Default

would the voes have anything to do with that? maybe an intake leak?
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Old 18th September 2007
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Default needle adjustment

Sounds like you need to adjust the needle to get a slightly richer mixture. It's probally going lean on you during the transition from pilot to main jet. Assuming the needle is stock and has not been modified.
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2002 XL1200S "The Black Beauty" NRHS 1250 kit CI, NRHS Stage 1 TS heads dual plugged, NRHS Hurricane Air Filter, SE 536 cams, Rich Products Thunder header, 42 Mikuni, Daytona Twin Tec ignition w/ Dyna coils. 97.4 HP, 85.5 Torque 1984 XR-1000 S&S Crank/rods w/windage tray, Vision Grinding Cylinders, Arias 11:1 compression pistons, Andrews XR-1000-1 cams, Baisley modified dual plugged heads, Rich Products Thunder header, 38mm Delortos, Daytona Twin Tec ignition w/ Dyna coils. (the never ending project but, got a 66 Barracuda drag car sucking up all the funds and time)
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